gnrc_sixlowpan_frag_vrb: fix cppcheck warning [backport 2020.07] #14686
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Backport of #14683
Contribution description
... which wasn't a false positive after all. See also #12848 (review)
Testing procedure
make -C tests/gnrc_sixlowpan_iphc_w_vrb flash test
and
make -C tests/unittests tests-gnrc_sixlowpan_frag_vrb flash-only test
should still succeed for any supported board of choice.
Issues/PRs references
See #12848 (review)